a script for ssh proxy under linux (using expect)

#/bin/bash

expect << END
set timeout 15
#kill the existing progress that have already be running
spawn sudo killall ssh
expect "sudo" {send "yourpwd\r"}
spawn sudo ssh -L .... #something you specify
expect {
    "sudo" {
        send "yourpwd\r"
        exp_continue
    }
    "yes" {
     send "yes\r"
     exp_continue
    }
    -nocase "password:" {
        send "sshpwd\r"
        exp_continue
    }
}
wait

END